It is known that the process of economical occupation, in the last forty years, it was extremely harmful to the environment and the traditional populations of the Amazon region, still persisting today the immense difficulties of reproduction of the families inside the forest. One of the principal challenges in the search of a Sustainable Development is the promotion of the economical development of the productive units, starting from the non timber forest products (NTFP), and, consequently, of the social reproduction of that population. It is aimed at in the present study to propose a feasible alternative of payment for the environmental services (PSA) promoted by the communities extrativistas, there is more than one century. For so much, it is looked for, initially, to accomplish a socioeconomic evaluation of the rural family production in Extractive Reserve (RESEX) Chico Mendes, in Xapuri-AC, in the sense of offering a coherent proposal with the needs of the studied families. It is used for so much own and specific methodology, for intermissions of measures and indicators of resulted economical, evaluating the evolution of the economical development of the last nine years in the area. The results indicate the decrease of the generation of income of products originating from of the NTFPs, demonstrating the difficulties of reproduction of that system and of the families, besides enhancing the invigoration of activities predatory of the forest, as it is the case of the extensive livestock, still accomplished in a rudimentary way. In the face of the levels of family reproduction, is calculated that the necessary minimum value for PSA would be US$ 13/ha, evidencing a necessary value and, at the same time, more appropriate front to the propositions of the average literature, that esteems values for the same services around US$ 50/ha.403489498Aaker, D.A., Managing Assets And Skills: The key to a sustainable competitive advantage (1989) California Management Review, 31 (2), pp. 91-106. , http://www.periodicos.capes.gov.br, winter. Disponível emAllegretti, M.H., Extractive Reserves: A proposal for forest development Amazon (1989) Pará Desenvolvimento, 25, pp. 3-29. , Extrativismo vegetal e reservas extrativistas, Belém, jan./dez. (in PortugueseBatista, A.V.C., (1995) Extractive Reserves: Origin, Defence and Questioning, , Monografia de graduação, UFAC, Rio, Branco, Acre. 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